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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e96a5390d308dc41f4211d4be2dc112e3594b5099dcdee7a2fa202b0b92d4ac' 
  AND token = 'cMANLKHPvtwQSh9HgkbPXG8CP3bETulO8iq5BB4qAe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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