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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aa113cd6cecdff8e868e33924bbccae457b16a0efef0b123180e4e083953a09' 
  AND token = 'M/1x772PpR8n2GgBDRy+uzO5E3FlZNCrJJQMrTq2LQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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