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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aa03443b657a38b03ec06c6b9cb6c6571629776afcc5d4a65a4d8394195d03d' 
  AND token = '5nu2fi/Z+pEBGsWLp43gsUkBDX4q3a2KyUJmklLn4U0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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