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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1912bed818bdfededc804a01ca97278043992ed146fc55409cb6e7ba75d2e079' 
  AND token = 'j45Nf3fU2Rftqwl/fuKIgPbD5sWKt5WfV8J+W9igLoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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