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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09328370f784da2cadd50226776396bcc8a404688fb7e6a2f61b05b54a2de4ff' 
  AND token = 'SkivQZJN93X7i5wBnCudcbUXsjk8iebzINNzeTO8zXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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