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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f5cfe1a1b31e8012ab5a0c19a7cb992be3449f07f2f1b514cfae5182d2f17af' 
  AND token = 'Wh5TuE2U71PVhW5PKff6LIGc4jXYlb5rTR4CMmQ720o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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