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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a5f32b7a3ef3cc68d3172fdcd5ac26e3b1467b896e05307ea21c882a5acdf78' 
  AND token = 'WSirvoTPBm5MVImsdKH813SGdFTRWTPYib1PjHCHgSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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