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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f52ab3dff9be6b17161d4671a726a0058485100b7918c0d26000685a9e50bde' 
  AND token = 'y/dlhvimzIL/ZvsvMjd5rrzS4uS6aV6slHLSVymzGfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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