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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eebc8a24bd2c4f295d10261a1430d24d915c3517a30a5ceaad2880c1b6bbe7fb' 
  AND token = 'QhVv0/0FXHG5s9ZV/8SDDJ5BbA/k0v8wkp424W4eGIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00205

JSON explain

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