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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d7d56ed73af871decdab36d6f49ebc4ffbb625e30d2e96c240777e148f52c1f' 
  AND token = 'vvsyAG2dpE3Xmh8kmEjsNi6QqAPjPM23x634BRFUeLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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