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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7202a2032bdd0b09c447f2f8d2dfd039b6067617245dd7c89dfe55fef6536718' 
  AND token = 'X26RXCT53t6yla8DR2W60CMlTtxJTBbiGUCuUenmhzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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