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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c339f82b194877674b0be53e4f70d15618ab3bcd40249d17fc6bf16f31db931' 
  AND token = 'J8wLz1QvKHZsf0ntLLFc1zOVZosgdscdnM8GJW5nJLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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