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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a69da301ca4577e79370db6e27c6f94ac620ad02643611928811c22e37bfc0e' 
  AND token = 'ey5aR4tJl5Kr5w7IX7SH7xKGfe6CpszZIy7p5qlZ360=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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