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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d44e6f48e714ff1b456778cc2c5ca632792b013a013f42aba085a047dbe59e2' 
  AND token = '+pAcrpxx2isMv43/Cewkyxw636vpmGtx+Ls42woTwkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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