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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5ee77eeb02ee84ea5499e2dd8d12943b3fb2718dda048414b8fa7b7d64741ca' 
  AND token = 'boUA/2nAz3rVHUOlYwh3kpczkn9tTgMX+bBOZdfgSdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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