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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cb775a23a9b10d91d825852ced091fe5fef21d105260be355f62bc69fb509d4' 
  AND token = 'kluAyohMHQCTco1jn0Iuz61L0cvmKNizdGsRQUM97Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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