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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffd7c5397c62bfd7230e5199bd5fde86d00480606775d589e4732acb318a86cd' 
  AND token = 'KppNr/oo7XQKgvUR0O8HCg2j10y3nQcrD8R8yZTT/ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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