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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a276364800fd2d2075c3d1e954a2e9ab5417444cf4b2add5d3357945675736f2' 
  AND token = 'azBE9PPUUna7qtrifIbFzg06hdTukOhRXdowhZEaepQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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