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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6b665db99ce1c991515fe4932874cff19b362991d4efed8c038d2143ba7cbef' 
  AND token = 'gJPOP1wbCUSbs/TfnakMJyWSC3x77ldtDB6uz1/XfAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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