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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faed1670569b0237bb951f19a23817e88f9389b5359124d34ab26edad60cf964' 
  AND token = '+FY+7WkjGQc+S9nA3O5rNyABveyUR1mRkmsORLKeL4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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