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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89ff9e6cdc54b5e820d9da1efc206a8c042716d279f74a0360b4e6be14a98d0b' 
  AND token = 'zAF30oO0UR166idD+ZYfm0zfKyewxaUhxmO7decXx1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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