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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8163d05b3d7ee5c7a7c47cf392f1022a8a84ecbb1245ea960590e5a9e50ea693' 
  AND token = '2T5UXb/zzGiRbKDhpGB8IJJvvMGA5ttzqXOAQQQF6ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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