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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ecab24cb445f8a9678e3d18352b3c0274b06375782dbeb4320a0370a537a62c' 
  AND token = '0dOTi7Ri1rTEKI7JUBXB1gCY7J+FG3Scqaqi/AfYmTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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