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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b9192244152c89cc78472d8e347a9d3c0bba79a8ebe2f2a59f870ca059a830e' 
  AND token = '7wp9In4vgvP8DaXJm3EkI8QcH6s3G7aTqQbmOt7Oumk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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