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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6217cacaf801ac0bcdfcc0097b330f30cd925e4104cd888ae08736eb6dd649b4' 
  AND token = 'BvFhHHraQrQJl+jtqx8WBtWtlO97Pp66kGxvnsgX6RI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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