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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3d4a6a0c08c9d309a72720aab0072a59d86142d4ffa3d55092357be6807720b' 
  AND token = 'A3aeFM6/EQZ44ZM8SUFDuYuReZfJz6BgA07ioJNOmqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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