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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccee0c660ad9b762e4b682dc3400b59e3c31f42a0326379c025d16f716a083be' 
  AND token = 'Op4NgAP+l0iWctpAN+hhrNRryQskXyN9+Qm10LYC5Mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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