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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deb225a7a8904c4155e2fce0f3f7f0f45c21073d3d08efc9e36ef5e6ab6b731c' 
  AND token = 'X4cAHTCJ/5Ld19xuRR4Wm585t/lyxVjV1gfMKkv93WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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