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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afcf86cb3649d51da10f7dd8b7b2cf02beec232f473c02a226a9b7e9e9e0168f' 
  AND token = '8nAHDwpmmpBE77viPKEHbNDwOTFwOoNsaKZuXCiOvBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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