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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1ebaca55d05188832d87f574a1c161a9513708fa5600e40e9e322b512734803' 
  AND token = 'aogTXepisRhKmtFM75iTm12t8lFa/dr5IEHeK6kXCII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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