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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68f4b2ce0d3e560171803dd6737748412fb11f10ad04f589665900026bb4a905' 
  AND token = 'jkjcMo4/godn1D4ZFrIt4T0gGaPEP+QNDZ0SlUQ2bB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}