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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f1b3b43adac844d422315dbe51e097fe3b5c981ebd3827d82fa26b4b7714710' 
  AND token = '6vED7shegJdAOZ7wOF32JZcsdU8GJSYcoFaC6oiQ/ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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