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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd283ea4ad8ffb02513dce38eeed4c540ddeb889e9a3ec58288763503b2fd03c8' 
  AND token = 'Wl2hNYvkI2McTj6TRkzUtqVwDBI/7e/IMsdy4c7dUEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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