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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eab086a07cd5cf86cbca6260f0cd72bdc8ad30bd61083e574e920ab5e53ad6a' 
  AND token = 'RTXdvzraT1sP1FMFQht95WXCFNAIJ2iDTcMsGjybLsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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