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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5984c27b6ef175c1e56488784def894a026331aed3c5e60e867d0e0ced6230e0' 
  AND token = '/OTW1pLuG3jD0v3A2KPSWe0JowW/V6JBFbTqb/VI3eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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