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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '173f6f459f421dd9a8e5d33fe2e288b2b43b6365ba5e4fc8c993d2583009330c' 
  AND token = 'nUvppIvVSxcI7xWyv5K73zKkxzz6RiaU8/m/lvXMZNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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