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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dfdbde77cfd6d35a2b1043fd395db330410cd1d78bf5aa2656e23431151b1c1' 
  AND token = 'dpeVPGuM0ysfh0SXwzPNcmr4u1x5/5wadqwGj0c+UME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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