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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c8d887b478261afeafc30bd0706fbe9069a2e79d3ad4cdbc4f6c09e197db169' 
  AND token = 'iQ63ofrIlJTF997r/HGErU9jlcBFibDFCr+iX+DijqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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