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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b20900f90129e9548912b731ae9088e34acb2d3a76930e1d5f8865962d88bf92' 
  AND token = 'OUxWR+KZxa9WN/tYvJxkf1xpEROQgvLZwTUQ9FLyetM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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