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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02bce8dc3211134c76407f5ea3d800eed790302ec0854bcd0b4b3a1aaa61fee2' 
  AND token = 'I09oOZymiJf1nH5ZVseAM1NmTcsWrw+32ppMwrRX5LA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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