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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c7b6debe2ded336c5d767e18c991e6ec72886ba3695a4ac563597081915c259' 
  AND token = 'PgKrSpTGA52PTI69qKTuMgR4Ivo8rOibxTptmVJZWMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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