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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9501922b498c862f4d351d6885ef3be6dab66d7c74bc55620e190dd45ef1ef74' 
  AND token = 'g8mZ3j85ZwyIfvZ2ahhEadO/f/Ari3V2TkYCVmabcUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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