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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fc964c5e42bce425cc633ec662277e8dc9c3fe6e2c9ddccceb3e7f5cd13dd7b' 
  AND token = 'Xpp2D0iXyAZxqvdLsDhF8m9HHMEGKw3oQ1l1StltlR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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