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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '024f7f4fcc8b1412fb3f77b55066f6726fb8fb40bac0e8b5e0d36e0f9f678d69' 
  AND token = 'hZb3jEqRKujE4NU1Mt/v64RZMQ5XvfM3JPcgLoSnQlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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