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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '888e00ebc81590b695d54acc2ce729b62c3e912c1d2b2dd89656db0fc836d376' 
  AND token = 'zrhFvOy0i2futUSpsOIxjrIVB+gDw9wcrTrDj3MWNiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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