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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1559ddc8c830026d1fac75d6463aa99a0e3c71afdd912154de5d0cc9708244df' 
  AND token = '/9r2Rvz2PZbXBAYsvY2smsTdufCXOryQjGkbrOc/sFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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