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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae5bc57df3ed0de94602f14fb86ebf481af603adb0803e6be5b02ec9fc8e6826' 
  AND token = 'X+eB1Z49gmxcRAo+AE/xY5Mv8mob99HxAL01OxN/fVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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