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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54977e680636fc33cf1a91068b73581370eb3e53fcd86e66eeb3b99e39035545' 
  AND token = 'v+IvM3dHgfvUwhp1qd9/yTQiXgern3Honr9SxI6ZuME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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