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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a9640ffa4edaa7c8d72191812cfadc291c0b69f38516a7988974a852bcbd4ac' 
  AND token = 'OHM0pCNzOiNLtkbAz6lMcFZPuFMmqDNdhh75JYKeoys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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