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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59a3891bc34dda756b9972e4d9fbf2c22abd8d783f92fdeeedd84782d8459b82' 
  AND token = '/06Kqc8WPE3oae09UOsqhOt2aEJjCHgYKQzRnfQFlMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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