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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '576a19bcd05e44c5fdd00826699c0907b88b07f64a8580c8be1c144eb4393598' 
  AND token = 'eh+Us/H0ImPQJ7iatycv8pX+2BS/xo3BV/kwa++p6/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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