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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20aa1bc60030a4fc3f9b3636937c265fce36639fc6b738d1b6e95cf351af89aa' 
  AND token = 'ozWJy4F3Zs1Ul+1Bho8Vf4y7Z1nuWkUR1wMeddZ+2WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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