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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ee5cea32d5e9e62dc4a241613713f764fe7f6b7dd956221e2199a2e141f4177' 
  AND token = 'WmpggQC2z9r7AAi+u8r7/JfVcgZXTt2DZFldPRQ4fpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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