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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ead275b2447bbd3adc1f6898aae6eb8a0a391d5217731ea29832b5104c7ab89' 
  AND token = 'VgkcxIVSZWSux8BlrajIhIx1khOtVcTUU3kyc2p4F1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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