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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a01053f6a0b26b6f2a86417a9244e6e4c086dba777373b7129f8caae411c551b' 
  AND token = 'bdRsI0QsIOsf1btAgvgJwJk6ie1NBjg+9yAnE4yw8yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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