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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a33da0d22f2ac6b28326cea7fe96dbf518e436e65c6f7c3d5ccc8e2d1659d5d' 
  AND token = '7/lbut6Ey93CLWDrnzjnZ93qevJ60lkRvCbz6J2Vckg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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