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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0bcf2d3535ec2de10d68686780bfc5b39306192b8dd528b8d6392cbc9426b4e' 
  AND token = 'bBfV7Gd2McME9invwTCQ9llk5c05vn361i63gV08TwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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