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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ec88e95a3fea91988a3e7efa4b6a328b13cb7a7f31ff4753835f95c8f4a513e' 
  AND token = '+LsSknxm4K4RjtsQgljsOOn3u+JdbbdhVXoHk3Deg90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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