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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7944552c8dd15cc433a43490630a6883f57167964590ed044049240e89a86e83' 
  AND token = 'UM0x1CdSQ+LqelIekF7fxD3Ke6itv+XBRZrr7WK5htk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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