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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0dad09b63af9e9fab443c29511e9d8fa37d48a13c317249f775199d6eea2ea7' 
  AND token = 'u7I59trEdD3a91knH7/1c7COZpfJXhqxMQuiJGhOPTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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